I've had this for a while and have had problems for a while - the power has to be off for both of my screens to work unless only my key with my zip will work . The device requires a hard reboot every time I use it now. Also, sometimes the resolution gets pixelated and I have to reset it. Now it's basically become useless - I'll probably just buy an Apple monitor adapter that works every time - I don't recommend you buy it - it's overpriced and will be junk in a year. I wish I had something better to say, but everything around it is flawed
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